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Colder Air May Arrive to Greet December in U.S. Midwest, South

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Nov. 25 (Bloomberg) -- Temperatures in the U.S. Midwest and South may be lower than normal as December begins.

Commodity Weather Group LLC President Matt Rogers said in his in 6- to 10-day outlook for Nov. 30 to Dec. 4 that temperatures will be about 3 degrees Fahrenheit (1.6 Celsius) below average from the southern Great Lakes to Gulf of Mexico.

“The general view today is that we are leaning the first third of December toward a marginal cold-dominated pattern for the Midwest, East and South,” Rogers said in a note to clients.

David Salmon of Weather Derivatives predicts a slightly smaller pattern of cold across the central and southern U.S. in his forecast for Dec. 1 to Dec. 5.

Traders use long-range temperature predictions to gauge energy use and market fluctuations. Hot or cold weather can increase demand for heating and cooling. Power plants use about 30 percent of the nation’s gas supplies, according to Energy Department data.

Rogers’s forecast said most of the rest of the U.S. will have seasonal temperatures during the period, except Northern California and parts of Montana, which will be warmer.

Salmon predicts that the upper Great Plains and Rocky Mountains will be 2 to 10 degrees higher than normal. He also said much of the U.S. Northeast, including New York City, will be 2 degrees above average.

In his 11- to 15-day outlook for Dec. 5 to Dec. 9, Rogers, based in Bethesda, Maryland, said colder air will cover an area from the Rocky Mountains to the Appalachians. Salmon, in Belton, Missouri, doesn’t issue an 11- to 15-day outlook.

The rest of the U.S. may have seasonal temperatures during that same timeframe, according to Rogers.

For Dec. 2, the average normal temperature in New York is about 43 degrees. It’s 40 in Boston, 44 in Washington, 49 in Atlanta, 32 in Chicago, 39 in St. Louis, 42 in Seattle and 55 in Burbank, California, according to MDA EarthSat Weather in Gaithersburg, Maryland.

To contact the reporter on this story: Brian K. Sullivan in Boston at

To contact the editor responsible for this story: Dan Stets at

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